docs: Update CONTRIBUTING.md to reflect removal of TypeScript (#989)

* docs: Update CONTRIBUTING.md to reflect removal of TypeScript

This commit updates the CONTRIBUTING.md file to reflect the latest changes in the project, specifically the removal of TypeScript. It provides clear instructions and guidelines for contributors on how to contribute to the project now that TypeScript is no longer a part of it.

* restored deleted yarn.lock file which was out of sight due to making PR from mobile phone

CONTRIBUTING.md

@@ -37,7 +37,7 @@ git checkout -b <your_branch_name>
 
 ### Testing
 
-Tests are run through `yarn` using [Web Test Runner](https://modern-web.dev/docs/test-runner/overview/) with [Playwright](https://github.com/microsoft/playwright) for browser testing. Browser and runtime configuration can be found in [`web-test-runner.config.mjs`](./web-test-runner.config.mjs) and [`playwright.config.ts`](./playwright.config.ts).
+Tests are run through `yarn` using [Web Test Runner](https://modern-web.dev/docs/test-runner/overview/) with [Playwright](https://github.com/microsoft/playwright) for browser testing. Browser and runtime configuration can be found in [`web-test-runner.config.mjs`](./web-test-runner.config.mjs) and [`playwright.config.js`](./playwright.config.js).
 
 To begin testing, install the browser drivers:
 
@@ -79,9 +79,9 @@ yarn test:browser --project=chrome --headed
 To run a single test file, pass its path as an argument. To run a particular test case, append its starting line number after a colon.
 
 ```bash
-yarn test:browser src/tests/functional/drive_tests.ts
-yarn test:browser src/tests/functional/drive_tests.ts:11
-yarn test:browser src/tests/functional/drive_tests.ts:11 --project=chrome
+yarn test:browser src/tests/functional/drive_tests.js
+yarn test:browser src/tests/functional/drive_tests.js:11
+yarn test:browser src/tests/functional/drive_tests.js:11 --project=chrome
 ```
 
 ### Running the local web server